Similar Documents at Salem |
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MONTHYEARML24016A1612024-01-10010 January 2024 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report and Data Collection Forms - Two Atlantic Sturgeon 1/9/2024 ML24002A7222023-12-29029 December 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - 2023 Annual Report - Inspection of the Circulating Water Intake Structure (Cwis) Trash Rack Bars ML24002A7242023-12-28028 December 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report and Data Collection Form - Sturgeon 12/28/2023 ML24002A7252023-12-21021 December 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Shortnose Sturgeon 12/21/23 ML23355A2732023-12-21021 December 2023 NRR E-mail Capture - (External_Sender) PSEG Response to Questions Associated with Supplement to Salem-Hope Creek Eab Reduction LAR ML23346A0962023-12-0606 December 2023 NRR E-mail Capture - Reminder - Final Report - Completion of Required Additional Protocol (AP) Information in Accordance with the U.S. - 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Permanent Extension of Type a and Type C Containment Leak Rate Test Frequencies ML23172A0982023-06-21021 June 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report - Kemp'S Ridley Sea Turtle Collected on 06/20/2022 ML23164A2062023-06-13013 June 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report - Kemp'S Ridley Sea Turtle Collected on 06/12/2023 ML23163A0442023-06-0606 June 2023 NRR E-mail Capture - (External_Sender) Biological Opinion GAR-2020-02842; FIN Clip Analysis Facilities ML23153A1552023-06-0202 June 2023 NRR E-mail Capture - (External_Sender) PSEG Bottom Trawl Sampling - Incidental Take Report and Data Collection Form - Atlantic Sturgeon 6/1/2023 ML23151A6582023-05-31031 May 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report and Data Collection Forms Sturgeon 5/30/2023 ML23137A2632023-05-17017 May 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - 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(External_Sender) Salem & Hope Creek Generating STATIONS-ANNUAL Incidental Take REPORT-STATION & REMP ML23033A0302023-02-0808 February 2023 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report Sturgeon 1/24/2023 ML23010A2882023-01-10010 January 2023 NRR E-mail Capture - (External_Sender) Salem Generating STATION-INCIDENTAL Take of Atlantic Sturgeon Collected on 01/09/2023 ML23003A2412023-01-0303 January 2023 NRR E-mail Capture - Final Nvib RAI - Salem Unit 2 Relief Request S2-I4R-211, Fourth Inservice Inspection (ISI) Interval Limited Examinations ML23003A2402022-12-21021 December 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report and Data Collection Form for Atlantic Sturgeon Collected on 12/20/2022 ML22357A0102022-12-21021 December 2022 NRR E-mail Capture - Final Nphp RAI - Salem Unit 2 Relief Request S2-I4R-211, Fourth Inservice Inspection (ISI) Interval Limited Examinations ML23003A2392022-12-20020 December 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report and Data Collection Forms for Atlantic Sturgeons Collected 12/19/2022 ML22333A9022022-11-29029 November 2022 NRR E-mail Capture - Final Iolb RAI - Salem 1 and 2 LAR to Revise TS to Extend Allowed Outage Time for Inoperable EDG ML22291A3702022-10-18018 October 2022 NRR E-mail Capture - Acceptance Review - Salem 2 - Relief Request Associated with the Fourth Inservice Inspection (ISI) Interval Limited Examinations (L-2022-LLR-0066) ML22290A2202022-10-17017 October 2022 NRR E-mail Capture - Final RAI - Salem 1 and 2 LAR to Revise TS to Extend Allowed Outage Time for Inoperable EDG ML22285A1562022-10-12012 October 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report Atlantic Sturgeon 10/11/2022 (Bottom Trawl) ML22280A1302022-10-0707 October 2022 NRR E-mail Capture - (External_Sender) PSEG Bottom Trawl Sampling - Incidental Take Report - Sturgeon 10/06/2022 ML22269A4822022-09-26026 September 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 09/23/2022 ML22269A0352022-09-23023 September 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 09/22/2022 ML22265A1512022-09-22022 September 2022 NRR E-mail Capture - Acceptance Review - Salem 1 and 2 - Relocate TS Requirements for Reactor Head Vents to TRM ML22286A2062022-09-14014 September 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 09/13/2022 ML22244A0422022-09-0101 September 2022 NRR E-mail Capture - Acceptance Review - Salem 2 - Revise and Relocate Reactor Coolant System PT Limits and Pops Limits to PTLR ML22244A1192022-09-0101 September 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 08/31/2022 ML22206A0262022-07-25025 July 2022 NRR E-mail Capture - Acceptance Review - Salem 1 and 2 - Revise TS to Extend Allowed Outage Time for Inoperable EDG ML22206A1032022-07-22022 July 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 07/21/2022 ML22194A0522022-07-13013 July 2022 NRR E-mail Capture - Acceptance Review - Hope Creek, Salem 1 and 2 - Relocate Staff Qualification Requirements to Licensee Quality Assurance Topical Report ML22188A0762022-07-0707 July 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 07/06/2022 ML22187A1482022-07-0606 July 2022 NRR E-mail Capture - (External_Sender) PSEG Bottom Trawl Sampling - Incidental Take Report and Data Collection - Sturgeon 07/05/2022 ML22199A2432022-06-29029 June 2022 NRR E-mail Capture - (External_Sender) Salem Generating Station - Incidental Take Report: Kemp'S Ridley Sea Turtle 06/28/2022 ML22129A0682022-05-0505 May 2022 NRR E-mail Capture - (External_Sender) PSEG Bottom Trawl Sampling - Incidental Take Report - 2 Sturgeon 05/04/2022 ML22122A0442022-05-0202 May 2022 NRR E-mail Capture - Acceptance Review - Salem 1 and 2 - Request for Relief from ASME Code Defect Removal for Service Water Buried Piping (L-2022-LLR-0040) 2024-01-10
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML22333A9022022-11-29029 November 2022 NRR E-mail Capture - Final Iolb RAI - Salem 1 and 2 LAR to Revise TS to Extend Allowed Outage Time for Inoperable EDG ML22318A1062022-11-14014 November 2022 Information Request for Quadrennial Baseline Comprehensive Engineering Team Inspection; Notification to Perform Inspection 05000272/2023011 and 05000311/2023011 ML22290A2202022-10-17017 October 2022 NRR E-mail Capture - Final RAI - Salem 1 and 2 LAR to Revise TS to Extend Allowed Outage Time for Inoperable EDG ML22055A0702022-02-22022 February 2022 NRR E-mail Capture - Final RAI - Salem 1-Relief Request Associated with Fourth Inservice Inspection (ISI) Interval Limited Examinations (L-2021-LLR-0085) ML21256A1902021-09-10010 September 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21144A2132021-05-24024 May 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21068A4142021-03-0909 March 2021 NRR E-mail Capture - Final RAI for Salem Unit 1 LAR to Revise and Relocate Pressurizer Overpressure Protection System Limits to Pressure and Temperature Limits Report ML21043A1442021-02-11011 February 2021 NRR E-mail Capture - Salem - Final RAI Alternative for Examination of ASME Section XI, Category B-B, Item Number B2.11and B2.12 (L-2020-LRR-0103) ML21021A2592021-01-21021 January 2021 NRR E-mail Capture - Final RAI - Salem 1 - Steam Generator Tube Inspection Report ML20281A5172020-10-13013 October 2020 Notification of Conduct of a Fire Protection Team Inspection ML18267A1712018-09-21021 September 2018 NRR E-mail Capture - Final RAI from PRA Branch: Revise Technical Specifications to Increase Inverter AOT Extension (L-2018-LLA-0140) ML18264A0122018-09-20020 September 2018 NRR E-mail Capture - Final RAI from I&C Branch: Revise Technical Specifications to Increase Inverter AOT Extension (L-2018-LLA-0140) ML18250A3132018-09-0606 September 2018 NRR E-mail Capture - Final RAI: Revise Technical Specifications to Increase Inverter AOT Extension (L-2018-LLA-0140) ML18171A3212018-06-20020 June 2018 NRR E-mail Capture - Final RAI: Revise Technical Specifications to Adopt TSTF-411 and 418 (L-2017-LLA-0442) ML18094B0832018-04-0505 April 2018 Enclosurequest for Additional Information (Letter to P. Duke RAI Regarding Entergy Operations, Inc.'S Decommissioning Funding Plan Update for Salem and Hope Creek, and Peach Bottom ISFSIs Docket Nos. 72-48 and 72-29) ML18067A1482018-03-0808 March 2018 Enclosurequest for Additional Information (Letter to P. R. Simpson Request for Additional Information Regarding Exelon Generating Company, Llc'S Decommissioning Funding Plan Update for Independent Spent Fuel Storage Installation) ML17212B1152017-07-31031 July 2017 Request for Additional Information - Salem Units 1 and 2 - Containment Fan Coil Unit Allowed Outage Time Amendment Request (CACs MF9364 and MF9365) ML17199A1122017-07-18018 July 2017 Request for Additional Information - Salem Units 1 and 2 - Accident Monitoring Instrumentation License Amendment Request (CAC Nos. MF8859 & MF8860) ML17192A1672017-07-11011 July 2017 Request for Additional Information - Salem Unit 1 - Steam Generator Tube Inspection Report ML17115A4032017-05-0909 May 2017 Request for Additional Information Regarding Relief Request SC-14R-171 - Use of Code Cases N-695-1 and N-696-1 ML16321A4642016-11-21021 November 2016 and Salem Nuclear Generating Station, Unit Nos. 1 and 2 - Request for Additional Information Regarding License Amendment Request to Remove Certain Training Requirements ML16218A0052016-08-11011 August 2016 Request for Additional Information Concerning Request for an Extension to Enforcement Guidance Memorandum 12-001 ML16195A4492016-07-14014 July 2016 Request for Additional Information Regarding Chilled Water System Modifications ML16188A4152016-07-0707 July 2016 Request for Additional Information Aging Management Program Plan for Reactor Vessel Internals ML16124A5802016-05-0303 May 2016 and Salem Nuclear Generating Station, Unit Nos. 1 and 2 - Redacted - Request for Additional Information Review of Security Plan Revision 17 Changes ML16013A1592016-02-17017 February 2016 Request for Additional Information Regarding Chilled Water System Modifications ML15287A1412015-11-0202 November 2015 Request for Additional Information License Amendment Request Regarding Replacement of Source Range and Intermediate Range Neutron Monitoring Systems ML15287A1052015-11-0202 November 2015 Request for Additional Information License Amendment Request to Isolate Unborated Water Sources and Use Gamma-Metrics Post-Accident Neutron Monitors During Mode 6 (Refueling) (CAC Nos. MF5831 & MF5832) ML15299A3832015-10-29029 October 2015 Supplemental Information Needed for Acceptance of Requested Licensing Action Amendment Request Regarding Chilled Water System Modification ML15069A1812015-03-31031 March 2015 Request for Additional Information Aging Management Program Plan for Reactor Vessel Internals (TAC Nos. MF5149 and MF5150) ML15075A2602015-03-24024 March 2015 Request for Additional Information Spring 2014 Steam Generator Tube Inspections ML15055A3772015-03-10010 March 2015 and Salem Nuclear Generating Station, Unit Nos. 1 and 2, Request for Additional Information Request to Update Appendix B to Renewed Facility Operating License DPR-70, DPR-75 and NPF-57 ML14197A6192014-07-24024 July 2014 and Salem Nuclear Generating Station, Units 1 and 2 - Request for Additional Information Regarding Cyber Security Plan Milestone 8 Implementation Schedule (Tac Nos. MF3384, MF3385 and MF3386) ML14168A2422014-06-28028 June 2014 Request for Additional Information Regarding Flooding Hazard Reevaluation ML14135A2912014-06-0202 June 2014 RAI Regarding Request for Relief SC-I4R-140 from American Society of Mechanical Engineers Boiler & Pressure Vessel Code, Section XI Requirements Regarding the Reactor Vessel Head Flange Seal Leak Detection ML14086A6362014-04-30030 April 2014 Request for Additional Information Regarding Core Operating Limits Report ML14066A2952014-03-0606 March 2014 Licensed Operator Positive Fitness-For-Duty-Test (FY14) ML13330A5672013-11-22022 November 2013 Request for Additional Information: Salem Units 1 and 2 - Relief Request SC-14R-133 Repair of Service Water Piping (TAC MF1375 & 1376) ML13304B4182013-11-0101 November 2013 Request for Additional Information Associated with Near-Term Task Force Recommendation 2.3, Seismic Walkdowns ML13304B9362013-10-29029 October 2013 Request for Additional Information: Salem Units 1 and 2 - Relief Request SC-14R-133 Repair of Service Water Piping (TAC MF1375 & 1376) ML13270A4142013-10-17017 October 2013 Interim Staff Evaluation and Request for Additional Information Regarding the Overall Integrated Plan for Implementation of Order EA-12-051, Reliable Spent Fuel Pool Instrumentation (TAC Nos. MF0913 and Mf ML13249A0112013-09-0505 September 2013 Weko Seal Relief Request RAI ML13196A3382013-07-15015 July 2013 2013 Decommissioning Fund Report RAI ML13192A2322013-07-11011 July 2013 Draft Request for Additional Information Overall Integrated Plan in Response to Order EA-12-051, Reliable Spent Fuel Pool Instrumentation. ML13186A1672013-07-11011 July 2013 Request for Additional Information Overall Integrated Plan for Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051) ML13179A3032013-06-28028 June 2013 RAIs for Salem Regarding Response to Order EA-12-051 (SFP Instrumentation) ML13137A4882013-06-0505 June 2013 Request for Additional Information Relief Request SC-l4R-133 ML13149A0862013-06-0505 June 2013 Request for Additional Information Decommissioning Funding Status Report ML13102A2752013-04-25025 April 2013 Request for Additional Information Change to PSEG Emergency Plan to Remove the Backup R45 Plant Vent Radiation Monitor Indications ML13063A7172013-03-11011 March 2013 Second Request for Additional Information Deletion of Condition for Inoperable Control Area Air Condition System/Control Room Emergency Air Conditioning System Isolation Dampers 2022-02-22
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Text
NRR-DMPSPEm Resource From: Kim, James Sent: Thursday, September 6, 2018 9:55 AM To: Duke, Paul R.; Thomas, Brian J.
Cc: Marabella, Lee A.
Subject:
Salem 1 and 2 - Final RAI RE: Inverter AOT Extension Attachments: Salem Inverter AOT - Final RAI.docx By letter dated May 16, 2018, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18136A866), as supplemented by letter dated June 14, 2018 (ML18169A218), PSEG Nuclear LLC (PSEG, the licensee), requested an amendment to Renewed Facility Operating License No. DPR-70 and DPR-75 for Salem Generating Station (Salem) Units 1 and 2. This license amendment request proposes to change Technical Specification (TS) 3.8.2.1, "A. C. Distribution - Operating." The proposed change would increase the Vital Instrument Bus (VI B) Inverters allowed outage time (AOT) from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for the A, B and C inverters to 7 days and from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for the D inverter to 7 days.
The NRC staff has determined that the additional information is required for the staff to complete its review. On August 24, 2018, the NRC staff sent PSEG the draft Request for Additional Information (RAI). This RAI relates to the licensees request to increase the Vital Instrument Bus (VIB) Inverters allowed outage time (AOT).
On September 5, 2018, the NRC staff and the licensee held a conference call to clarify the request. A publicly available version of this final RAI (attached) will be placed in the NRCs ADAMS. Subsequently, the licensee agreed to respond to this request by October 12, 2018.
Jim Kim Project Manager - Salem Generating Station NRR/DORL/LPL1 301-415-4125 1
Hearing Identifier: NRR_DMPS Email Number: 551 Mail Envelope Properties (BN6PR09MB1332F8777C306E8A16F07538E4030)
Subject:
Salem 1 and 2 - Final RAI RE: Inverter AOT Extension Sent Date: 9/6/2018 9:54:34 AM Received Date: 9/6/2018 9:54:00 AM From: Kim, James Created By: James.Kim@nrc.gov Recipients:
"Marabella, Lee A." <Lee.Marabella@pseg.com>
Tracking Status: None "Duke, Paul R." <Paul.Duke@pseg.com>
Tracking Status: None "Thomas, Brian J." <Brian.Thomas@pseg.com>
Tracking Status: None Post Office: BN6PR09MB1332.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 1380 9/6/2018 9:54:00 AM Salem Inverter AOT - Final RAI.docx 24412 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Recipients Received:
REQUEST FOR ADDITIONAL INFORMATION SALEM GENERATING STATION, UNITS 1 AND 2 LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATIONS ACTION 3.8.2.1.b REGARDING VITAL INSTRUMENT BUS INVERTERS DOCKET NOS. 50-272 and 50-311 By letter dated May 16, 2018 (Agencywide Documents Access management System (ADAMS)
Accession No. ML18136A866), PSEG Nuclear LLC (PSEG, the licensee), requested an amendment to Renewed Facility Operating License No. DPR-70 and DPR-75 for Salem Generating Station (Salem) Units 1 and 2. This license amendment request proposes changes to changes to Technical Specification (TS) 3.8.2.1, "A. C. Distribution - Operating." The proposed change would increase the Vital Instrument Bus (VI B) Inverters allowed outage time (AOT) from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for the A, B and C inverters to 7 days and from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for the D inverter to 7 days.
The Electrical Engineering Operating Branch (EEOB) staff has determined that the following additional information is needed to complete the review of the Salem license amendment request (LAR).
Regulatory Requirements The following Nuclear Regulatory Commission (NRC) regulatory documents are applicable to the staffs review of the licensees amendment request:
The general design criteria that were followed in the design of this plant are the Atomic Industrial Forum (AIF) version, as published in a letter to the Atomic Energy Commission from E. A. Wiggin, Atomic Industrial Forum, dated October 2, 1967. The criteria were developed as performance criteria which define or describe safety objectives and procedures, and they provide a guide to the type of plant design information which is included in this report.
In addition to the AIF General Design Criteria, the Salem was designed to comply with PSEGs understanding of the intent of the AEC's proposed General Design Criteria, as published for comment by the AEC in July 1967. The application of the AEC's proposed General Design Criteria to the Salem station is discussed in Section 3.1.2 of the updated safety evaluation report.
Salem General Design Criterion 24, Emergency Power for Protection Systems, requires that in the event of loss of all offsite power, sufficient alternate power sources of power shall be provided to permit the required functioning of the protection systems.
Salem General Design Criterion 39, Emergency Power for Engineered Safety Features, requires that Alternate power systems shall be provided and designed with adequate independency, redundancy, capacity, and testability to permit the functioning required of the engineered safety features. As a minimum, the onsite power system and the offsite power system shall each, independently, provide this capacity assuming a failure of a single active component in each power system.
Title 10 of the Code of Federal Regulations (10 CFR) Part 50.36, Technical Specifications, requires, in part, that the operating license of a nuclear production facility include TS.
10 CFR 50.36 (c)(2) requires that the TS include limiting conditions for operation (LCOs) which are the lowest functional capability or performance levels of equipment required for safe operation of the facility. When an LCO of a nuclear reactor is not met, the licensee shall shut down the reactor or follow any remedial action permitted by the technical specifications until the condition can be met.
To issue or amend a license with a particular remedial action, the Commission must be able to find, among other things, that there is reasonable assurance that the activities authorized by the operating license (e.g., continued operation for a set amount of time when an LCO is not met) can be conducted without endangering the health and safety of the public.
The staff also considered the following guidance documents to evaluate the LAR:
The NRC staffs guidance in BTP 8-8 for reviewing LARs for AOT extensions for electrical power sources states that the licensee must provide justification for the duration of the requested AOT (actual hours plus margin) based on plant-specific past operating experience.
In addition, Regulatory Guide 1.93 Revision 1 on Availability of Electric Power Sources, indicates that another subsequent single failure as a possibility that would necessitate severe restriction on the time allowed.
EEOB RAI-1 LAR Section 2.3, Reason for the Proposed Change, states:
Salem performs preventative maintenance on the VIB inverters during refueling outages.
There are no current plans to perform routine preventive maintenance on a scheduled basis at power. Should the need for such maintenance be identified as a result of component performance, the necessary preventive maintenance would be planned and scheduled in accordance with PSEG procedures for on-line work management.
Experience both at Salem and at other nuclear power plants has shown that the current AOTs for restoration of an inoperable VIB inverter are insufficient in certain instances to support on-line troubleshooting, corrective maintenance, and post-maintenance testing while the unit is at power. Specifically, Salem has entered TS 3.8.2.1 LCO due to an inoperable inverter 5 times since 2009. The actual times in the LCO were 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> 28 minutes in 2009, 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> 39 minutes in 2014, 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> 33 minutes in 2016, 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> 47 minutes in 2017 and 32 hours3.703704e-4 days <br />0.00889 hours <br />5.291005e-5 weeks <br />1.2176e-5 months <br /> 50 minutes in 2018 (for the D inverter): however in these instances, the cause of the failures was readily evident. This allowed the troubleshooting process to be minimized thereby allowing for a quick repair and subsequent testing.
The LAR requests changes to Technical Specification (TS) 3.8.2.1, "A. C. Distribution -
Operating." The proposed change would increase the Vital Instrument Bus (VI B) Inverters allowed outage time (AOT) from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for the A, B and C inverters to 7 days and from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for the D inverter to 7 days. Based on the above operating experience that needed a maximum of 33 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br />, the licensee has not justified the duration of the AOT extension requested for either preventive or corrective maintenance for the inverters at Salem. Therefore, the licensee is requested to provide technical justification for the duration of the requested AOT
(actual hours plus margin based on plant-specific past operating experience and vendor recommendations).
EEOB RAI-2 LAR Section 2.1, System Design and Operation, states The safety related 115V A.C. instrument and control power system is divided into four independent power supply channels (A, B, C, and D) for each unit, designed to provide reliable uninterrupted source of power for reactor control instrumentation, reactor protection instrumentation and safety-related equipment. Each channel supplies its associated safety related electrical load group. Vital instrument bus loads are assigned to load groups such that a loss of any one vital instrument bus will not will prevent the operation of the required safety systems during a postulated design basis event.
The NRC staffs guidance in BTP 8-8 for reviewing LARs for AOT extensions for electrical power sources recommends the provision of a supplemental power source capable of performing the function of the inoperable equipment during the extended AOT. The NRC staff notes that the licensee did not discuss the provision of a supplemental power source during the extended AOT. To allow the NRC staff to evaluate the technical adequacy of the extended AOT for inoperable inverters, provide the following information:
In case another inverter would fail in a redundant channel during the proposed extended AOT for restoring inoperable inverters in one channel to operable status, provide a discussion that describes:
- a. The plant configuration, response, and effects on the plant safety-related systems required to mitigate a design basis event (DBE) and their safety functions after the second inverter fails.
- b. The use of a supplemental 115 V AC power source such as a spare inverter or a UPS, the compensatory measures, equipment alignment, and the procedures in place to address the potential consequences to the plant in the event of a DBE or an anticipated operational occurrence if there would be a potential loss of safety functions or reduction in defense in depth of affected safety systems. If there is not a need to use a supplemental 115 V AC power source, please provide a justification.